Fungicide and bactericide



Patented Feb. 3, 1931 I 1,791,430

UNITED STATES PATENT OFFICE" JOHN W. ROBERTS, OF WASHINGTON, DISTRICT OFCOLUMBIA FUNGIGIDE AND BAGTERICIDE No Drawing. Application filed October12, 1928. Serial No. 812,197.

(GRANTED UNDER THE ACT OF MARCH 8, 1883, AS AMENDED APRIL 80, 1928; 8760. G. 757) This application ismade under the act very finely and applieddry by means of a approved pril 30, 1928, and the invention duster orblower. herein described ma 'be manufactured and The zinc sprays alsoact as stimulants to used by or for the overnment for governpeach trees.The foliage of sprayedtrees is mental purposes without payment to Ine'ofinvariably a darker green than that of un- 55 any royalty thereon. Ihereby dedicate the sprayed trees. invention herein described to thefree use of It will be understood from the foregoin the public, to takeeffect upon the grant of a that my invention consists of a fungicide anpatent to me. bactericide comprising zinc sulphate and hy- My fungicideand bactericide consists of drated. lime to which may be added, if de-60 the following ingredients in approximately sired, a substance thatwill add to the suspenthe proportions stated: sion and spreading powerof the product and Zinc sulphate four pounds; hydrated lime to which mayalso be added water, if desired, three to four pounds; water fiftygallons; and to produce a spray. My invention also comlime caseinone-half pound, or alum (alumiprises a method for the control offungicides num otassium sulphate) one and one-half and 'bactericides,particularly in peach trees, poun s, or other substances adapted to inbyspraying plants and trees affected with crease' the suspension andspreading power fungi and bacteria with the above described of thefungicide. and bactericide. materials. These sprays may be described asa Bor- .I claim: deaux mixture in which zinc sulphate issub- 1. Afungicide andbactericide comprising 'stituted for copper sulphate and towhich, in zinc sulphate and lime.

the one case, lime casein is added, and in the 2. A fungicide comprisingzinc sulfate and other case, aluminum potassium sulphate is lime. addedfor the pur ose of holding the mixture I JOHN W. ROBERTS.

in suspension an also as a spreader. The sprays may also be described as'a solution of zinc salt from which zinc hydroxide is precipitated outby the addition of an hydroxide,

such as calcium hydroxide. The suspension and spreadingb power may beaided by the addition of Sn stances such as lime casein or aluminumpotassium sulphate. 35 These sprays have been used for the control ofthe disease of the peach commonly maown as bacterial spot or bacteriosisand caused by Bactefium pram. Ex eriments indicate that they can besuccess all used I q for this pur ose and, perhaps, also or the controlof 0t er peach diseases, such as scab and brown rot, which are caused byfungi. It is also possible that diseases of other lants may becontrolled by these sprays. o m- V jury to peach foliage has been noted,even irhsn the applications of the spray have been Tla e essentialingredients could be mixed together dry and addedjto the water when mneeded. The zinc compound and. the hydrated lime may be mixedtogether,-ground

